basic

Stairs Riser/Tread Count from Total Rise and Run Calculator

risers = round(total_rise / target_riser); tread = total_run / (risers − 1).

Compute the number of risers, individual riser height, individual tread depth, and total horizontal run for a flight of stairs given the floor-to-floor rise and a target riser height (~7 in is the common code-compliant ergonomic optimum). Reports each dimension and a code-compliance flag (riser 4-7¾ in, tread ≥ 10 in).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

in
in
in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

risers = round(rise / target_riser); tread = run / (risers − 1).

In depth

Compute the number of risers, individual riser height, individual tread depth, and total horizontal run for a flight of stairs given the floor-to-floor rise and a target riser height (~7 in is the common code-compliant ergonomic optimum). Reports each dimension and a code-compliance flag (riser 4-7¾ in, tread ≥ 10 in).